A single course of antibiotics is strong enough to disrupt the normal makeup of microorganisms in the gut for up to a year, potentially leading to antibiotic resistance, says research published in mBio. Antibiotics are increasingly unable to fight bacteria as resistance develops. For 70 years, antimicrobial agents, known as antibiotics, have been successfully fighting infectious diseases, dramatically reducing rates of illness and death worldwide. However, their widespread use has led to adaptations in the infectious organisms that they are designed to kill, reducing the drugs' effectiveness. In the US, antibiotic-resistant bacteria cause at least 2 million cases of disease...